The Performance Research Of The Photovoltaic Thermoelectric Heat Recovery Fresh Air Ventilator

Currently,the development of non-polluting and abundant solar energy resources can effectively alleviate the increasingly stern pressure on energy and environment in our country.Meanwhile,photovoltaic power generation and thermoelectric technologies have developed rapidly due to their unique advantages.In order to reduce the energy consumption of outdoor fresh air in winter to achieve energy saving and environmental protection,this paper proposes a novel photovoltaic thermoelectric heat recovery fresh air system by combining photovoltaic power generation technology with thermoelectric cooling/heating technology.Photovoltaic thermoelectric heat recovery fresh air system consists of photovoltaic modules and thermoelectric new fan module.In winter,the photovoltaic modules preheat the outdoor fresh air by using fresh air channels that comprise photovoltaic panels and insulation boards while generating power,to recycle waste heat from the back of photovoltaic panels.After entering a warm side of heatpip e heatsink of the thermoelectric new fan module through an air supply passage,the preheated outdoor fresh air is heated again,and then is fed into a room.Simultaneously,indoor exhaust air passes through a cold side of the heatpipe heatsink,thus realizing an active heat recovery of waste heat from the exhaust air,reducing the temperature difference between both ends of the thermoelectric chip,and enhancing operating efficiency of the thermoelectric chip.The fresh air system enables the photovoltaic power to be readily used immediately when it is generated and recycles the waste heat twice,with a high power generation efficiency and energy saving and environmental friendly nature.Furthermore,in terms of stabilizing the temperature of test room in an artificial environment and ensuring the accuracy of the experimental data collection,precision air conditioner has a better control effect,but is costly.The new method employing an air conditioner in a cooling mode together with an electric heater,pro posed by this paper,can stabilize the temperature of test room in an artificial environment in winter with a low cost,simple operation and desired effect.There is a match among the cooling capacity of air conditioner Q₁,the heat load of the test room Q₂,the power of the electric heater Q₃ and the power of other equipment in the test room Q₄.When the set temperature of the air conditioner is the same,the smaller the absolute value of Q₁+Q₂-Q₃-Q₄,the stabler the temperature fluctuation frequency in th e test room in an artificial environment and the smaller the vibration amplitude.The experiments and testing research on photovoltaic thermoelectric heat recovery fresh air system are performed by establishing an experimental test platform.The experimenta l results show that the maximum generation power of the photovoltaic panels is 187.7W and the maximum power generation efficiency is 13.42%;the maximum temperature rise of outdoor fresh air in preheating section reaches 9.24?,and the maximum heat gain in preheating section is 288.09W,with 67.33%of the maximum heating efficiency and27.12%of the average heating efficiency;the maximum temperature rise of the fresh air in the thermoelectric new fan section reaches 15.07?and the maximum heating capacity is 469.6W,with the maximum heating coefficient of the thermoelectric chip being 13.16 and the average heating coefficient being 3.95;the maximum total temperature rise of the fresh air system is 20.19?and the maximum heat gain thereof is 629.08W,with the maximum heating coefficient being 15.75 and the average heating coefficient being 5.31;and the total utilization efficiency of solar energy is90.81%and the average utilization efficiency is 48.18%.The photovoltaic thermoelectric heat recovery fresh air system enables the comprehensive utilization of photothermic and photoelectric energy,significantly reduces building energy consumption,and enables ventilation to improve indoor air quality and comfort.This system provides a novel method for the ap plication of building-integrated photovoltaic system and building conservation.